381887017 has 4 divisors (see below), whose sum is σ = 387118420. Its totient is φ = 376655616.

The previous prime is 381886987. The next prime is 381887021. The reversal of 381887017 is 710788183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97930816 + 283956201 = 9896^2 + 16851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381887017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381887057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2615592 + ... + 2615737.

It is an arithmetic number, because the mean of its divisors is an integer number (96779605).

Almost surely, 2^381887017 is an apocalyptic number.

It is an amenable number.

381887017 is a deficient number, since it is larger than the sum of its proper divisors (5231403).

381887017 is an equidigital number, since it uses as much as digits as its factorization.

381887017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231402.

The product of its (nonzero) digits is 75264, while the sum is 43.

The square root of 381887017 is about 19541.9297153582. The cubic root of 381887017 is about 725.5126090178.

The spelling of 381887017 in words is "three hundred eighty-one million, eight hundred eighty-seven thousand, seventeen".